DK Never Overcap RP 2.0.0

A rewrite of BDK Never Overcap RP. It now covers every Death Knight spec, has its own look, and costs next to nothing.

• All three specs. Blood, Frost and Unholy, each on or off, each with its own color. The addon is now called DK Never Overcap RP.
• New, hand-drawn visuals instead of the game's spell alert textures. Around you: Rune circle, Halo, Arcs, Sigil or Embers. On the screen: Edge glow or Corners. Use one of each, or either alone.
• Easy on the eyes. Softer by default (70% max opacity, muted colors). Opacity glides with a short ease instead of jumping, and the near-cap pulse is a slow breath rather than a flash.
• A new settings window, flat and compact, with a live Preview. It opens from the minimap button or Options → AddOns, works in combat, and other UI skins leave it alone.
• Light by design. Nothing runs every frame: the addon reacts only to your runic power. On other classes it does nothing at all after login. Pattern textures load only when you pick them.
• Quiet. No chat messages and no slash commands.
• Minimap button that works with LibDBIcon when another addon has loaded it, so minimap skins and button bars treat it like any other launcher.
• Works in Midnight combat, where runic power can be hidden from addons.

Settings from 1.x don't carry over, because the addon has a new name.